text: Using nerve growth factor (NGF) as a neurotrophic co-dopant could induce ideal cell responses in vivo. NGF is a water-soluble protein that promotes the survival and differentiation of neurons. The addition of NGF into polymeric films can induce biological interactions without compromising the conductive properties or the morphology of the polymeric film. Various polymers such as PPy, PEDOT, as well as collagen, can be used as electrode coatings. Extended neurites for both the PPy and PEDOT show that the NGF is biologically active.